Avengers: Endgame quickly became the highest-grossing film of all time when it stormed cinemas in 2019. James Cameron's Avatar has since reclaimed pole position (thanks to a subsequent re-release in China), but half a decade on, the fourth Avengers movie is still the most successful superhero film ever made.
As the final culmination of Marvel's first three phases, Avengers: Endgame was a natural jumping off point for many, including Iron Man star Robert Downey Jr., along with co-directors Joe and Anthony Russo. It's in the name, after all, yet it turns out Endgame wasn't quite as final for everyone involved as fans once believed.
